Tripod stool



FIG. 1 is a front perspective view of a tripod stool showing my design;

FIG. 2 is a rear elevational view;

FIG. 3 is a side elevational view;

FIG. 4 is a top plan view; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a tripod stool, as shown. 